Compact Wide-Angle Optical System for Field Aberration Correction
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Solution Overview
Problem
Compact wide-angle lenses for image capturing apparatuses face challenges in correcting field curvature and astigmatism due to increased positive refractive power, which affects optical performance around the screen.
Innovation Solution
An optical system with a configuration of a positive front lens unit, an intermediate lens unit, and a rear lens unit, where the intermediate lens unit moves to adjust intervals between the front and rear lens units, satisfying the inequality 0.01<fLP/EA<0.80, allowing for increased refractive power while minimizing system size and correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the positive refractive power is increased to achieve compact wide-angle lens, then the entire length is reduced, but field curvature and astigmatism cannot be corrected
Solution Approach 1:
The optical system is divided into three lens units with specific refractive power distributions: a front lens unit with positive refractive power, an intermediate lens unit with negative refractive power, and a rear lens unit with positive refractive power. This segmentation allows each unit to contribute differently to the overall optical performance, enabling compact design while correcting aberrations.
Solution Approach 2:
Each lens unit is designed with specific local optical properties: the front lens unit provides positive refractive power for compactness, the intermediate lens unit provides negative refractive power for aberration correction, and the rear lens unit provides positive refractive power with specific constraints on its effective diameter to control field curvature and astigmatism locally.
2Adaptability or versatility
If the refractive power of the lens unit is increased to make the optical system wide-angled, then the angle of view is increased, but field curvature and astigmatism occur
Solution Approach 1:
The intermediate lens unit with negative refractive power acts as a mediator between the front and rear lens units. It compensates for the field curvature and astigmatism introduced by the positive refractive power of the front lens unit, enabling wide-angle performance while maintaining optical quality.
Solution Approach 2:
The optical system uses a composite arrangement of lens units with different refractive power characteristics (positive, negative, and positive). This composite structure combines the benefits of wide-angle capability from the high positive refractive power with aberration correction from the negative refractive power intermediate unit.
3Length of moving object
If the positive refractive power is increased to reduce system size, then compactness is achieved, but it becomes difficult to correct aberrations
Solution Approach 1:
The optical system employs a dynamic configuration where the intermediate lens unit can move to change intervals with the front and rear lens units during focusing. This dynamic adjustment allows the system to maintain optimal aberration correction across different focus distances while keeping the overall system compact.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a wide-angle optical system with improved performance around the screen, reduced size, and high-speed autofocusing by effectively correcting field curvature and astigmatism without significantly increasing system length.
Implementation Method 1
an optical system according to embodiments of the present disclosure includes, in order from an object side to an image side, a front lens unit with positive refractive power, an intermediate lens unit, and a rear lens unit
Data Source
AI summary
An optical system includes a front lens unit with positive refractive power, an intermediate lens unit, and a rear lens unit in order from an object side to an image side. The intermediate lens unit moves to change an interval between the front lens unit and the intermediate lens unit and an interval between the intermediate lens unit and the rear lens unit in focusing from infinity to a close range. The focal length of the front lens unit and the effective diameter of a lens surface closest to the image side in the rear lens unit satisfy a predetermined inequality.